Electron collisions with positive ions. Progress report, April 1, 1980-March 31, 1981
Collision strengths for electron impact excitation of the 2s-2p, 2s-3s, and 2p-3s doublets of Li-like 0/sup 5 +/ were calculated for energies between the 3s and 3p levels, and for excitation of the 2s-2p, 2s-3s, 2s-3p, and 2p-3p doublets for energies between the 3p and 3d levels. Calculations were made in a five-state close-coupling approximation. Autoionization resonances in the scattering collision strengths were included through quantum defect theory analysis. Resonance contributions enhanced the allowed 2p-3s collision strength by factors of 6.8 and 2.8 in the energy regions, respectively. The forbidden 2s-3s collision strength is enhanced by lesser amounts, by factors of 2.0 and 1.2, respectively. Collision strengths were calculated for Zn/sup +/ from the 4s ground state to excited states 4p, 3d/sup 9/ 4s/sup 2/, 5s, and 4d in a five-state close-coupling approximation for the electron impact energy range 15 < E < 400 eV. Very good agreement with measurements of absolute emission cross sections of Rogers et al. was obtained for the energy range 15 < E < 100 eV, when cascade contributions were included. A two-state close-coupling approximation was used to calculate inner-shell excitation of Zn/sup +/ for transitions 3d/sup 10/ 4S ..-->.. 3d/sup 9/ 4s5l. These excitation-autoionization processes were shown to enhance by factor of two, the ionization cross section for Zn/sup +/ in the energy region up to five times the ionization threshold.
- Research Organization:
- Louisiana State Univ., Baton Rouge, LA (USA). Dept. of Physics and Astronomy
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AS05-80ER10609
- OSTI ID:
- 6592898
- Report Number(s):
- DOE/ER/10609-02; TRN: 81-006430
- Country of Publication:
- United States
- Language:
- English
Similar Records
Excitation and ionization of highly charged ions by electron impact. Progress report, August 1, 1979-August 31, 1980
Effect of resonances on 2s-2p and 2l-3l' excitation of Li-like ions by electron impact
Related Subjects
ELECTRON-ION COLLISIONS
EXCITATION
OXYGEN IONS
ZINC IONS
AUTOIONIZATION
CROSS SECTIONS
EV RANGE 10-100
EV RANGE 100-1000
EXCITED STATES
GROUND STATES
MULTICHARGED IONS
P STATES
RESONANCE
S STATES
CHARGED PARTICLES
COLLISIONS
ELECTRON COLLISIONS
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EV RANGE
ION COLLISIONS
IONIZATION
IONS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena